Brake shoe



pril s, 1930. L. E. LA BRlE 1353208- BRAKE- SHOE Filed Dec. 5, '1928 INVENTOR. LUDGER E. LA BRE. WC e z;

A TTORNEY Patentecl Apr. 8, 1930 UNI ED STAT'ES PATENT OFFICE* LUDGER E. LA. IBRIE, OF SOUTH BENI), INDIANA, ASSIGNOR TO BENDIX BRAKE COM- PANY, OF SOUTH BEND, INDIANA, ,A CORPORATION OF ILLINOIS BBAE SHOE Application filed December This invention relates to brake shoes and is illustrated as embodied in a shoe for an internal expanding automobile brake. An object of the invention isto provide a shoe built up of stampings, preferably in such a manner as to form a generally channel-section shoe,

In one desirable arrangement there are two sections L-shaped in cross section arranged applying end of the shoes wherein a thrust link having a laterally eXtending portion is securely nested and confined within a space I defined by the longer web portion of the shoe,

an end flange on said web, and a cup-shaped fiange at the end of the rim of the shorter webbed and reini'orcing section of the shoe.

The above and other objects and features of the invention, including various novel combinations of part-s and desirable particular constructions, Willbe apparent from the following description of one illustrative embodiment shown in the accompanying drawing, in which o 'Figure 1 is a section through a brake enibodying my novel shoe taken just inside the head of the 'brake drum;

Figure 2 is a partial sectiontaken on the line 2-2 of Figure 1 indicating the cam and link structure, together with parts of the shoes broken away; and

V Figures 3 and 4: are sections taken on the lines 3-3-and 4-4, Figure 1, indicating respectively the shoe construetion 'intermediate its ends and its connection with the cam thrust link.

The shoe selected for illustration is built up from two sections or stampings, pressed from sheet steel, and including straight radial reinforcing portion's or webs 10 and 12 at opposite sides of the shoe, and superposed generally in cylindrical circumferential 5, 1928. Serial No. 323312.

fianges 14 and 16, secured` together by rivets or other fastenngs 18, which fastenings may also serve to attach brake lining 20.

I( preferably make' Web portion 10 longer than the web portion 12 and arrange it next the hacking plate, making possible a very short anchor, thus minimizing the overhang and increasing the strength. 4 u

According to an important feature of my nvention, 1 provide a novel arrangement of cam and shoe Whereby the thrust ot the cam is readily` controlled 'and quite positive in its operation, play between these parts with( the inevitable objectionable change in leverage being reduced to a' minimum. This result 1; accomplish by continuing the circumferential flange 14 at one end of the shoe to provide fiange 22 preferably rounded to nest within a correspondingly shaped anchor boss 2 & on the backing plate and thence tapered at 26 to a relatively narrow reinforcing ange 28& The circumferential lange 16 is preferahly turned inwardly at one end at 30 to define a cup-shaped recess, cut away at the side next the hacking plate to house a laterally projected end portion of cam thrust link The link is thus securely nested within the recess provided by the shoe, being confined against radial, lateral and circumferential movement by the parts described but withal capable of its necessary pivotal movementu The thrust links are preferably actuated by a novel link 34 and a crank lever 36 all as 'more fully described and claimed in my copending application ?261,068, filed March 12, 1928. The tWo shoes of the fioating riction device shown are connected at their lower' end by a novel' wedge adjus'tment described 'and claimed in my co-pending application -No. 285, 289 filed June 14, 1928, are applied by the toggle against the resistanceof the conventional return springs'38 and anchor at either end, depending upon the direction of drum rotation, upon the anchor boss *While but one illustrated embodiment of my invention is shown and described in detail, it isnot my intention to limit the scope of the invention to that particular embodiment, or otherwise than by the terms of the appended claimsn 4 I claim:

l A chanel-shaped brake shoe comp'sing two parts, each with a radial portion and a crc umferential flange, the two circumferential fianges being superposed and the two 'radial portions being of unequal Width and forming the sides of the channel.

2. A channel-shaped b'ake shoe of pressed metal having superposed portions defining the rim of the shoe, one of said superposed rim portions being inwardly bent at the shoe end to define With the sides of the channel a recess adapted to receive a cam Operating part.

3. A brake shoe of channel section having =the base of said channel, which defines the rim of the shoe, consisting of superposed portions, one of said portions cupped inwardly at its end and having a portion of said cupped area cut away for the purpose described.

4. A chanel-shaped bi'ake shoe coniprising `a rim and sides, the 'inbeing bent inwardly at one end of the shoe to` define a I'ecess for the purpose described. 3

5. A brake shoe fabricated 'from L-section stampings arranged to telescope one within the other, the web of one shoe being shorter than that of the other shoe.

6. A channel-shaped br'ake shoe having one side web thereof extended laterally at one end of the shoe to define a rounded thrust taking flange, which fiange is tapered to merge into a circumferentially extending reinforcing fiange at the edge of the Web.

7. A brake comprising, in combination with a drum, a brake shoe fitting within said drum and consisting of two arallel sides and a connecting rim, one of said sides having a laterally extending fiange at one end of the' shoe, the rim being curved inwardly at said end and definng with said fiange a confining recess housing one end of an Operating thrust link.

In testmony whereof, I have hereunto signed my name.

LUDGER E. LA BRIE.

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